18920740 has 12 divisors (see below), whose sum is σ = 39733596. Its totient is φ = 7568288.

The previous prime is 18920701. The next prime is 18920747. The reversal of 18920740 is 4702981.

It can be written as a sum of positive squares in 2 ways, for example, as 4129024 + 14791716 = 2032^2 + 3846^2 .

It is not an unprimeable number, because it can be changed into a prime (18920747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 472999 + ... + 473038.

It is an arithmetic number, because the mean of its divisors is an integer number (3311133).

Almost surely, 2^18920740 is an apocalyptic number.

18920740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18920740 is an abundant number, since it is smaller than the sum of its proper divisors (20812856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18920740 is a wasteful number, since it uses less digits than its factorization.

18920740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946046 (or 946044 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 18920740 is about 4349.7976964452. The cubic root of 18920740 is about 266.4685994494.

The spelling of 18920740 in words is "eighteen million, nine hundred twenty thousand, seven hundred forty".